ZHANG, Ruda July 17, 2022:  Replace 'matrix theory' with 'matrix analysis'. Reorganize notes. More on orthogonal matrices. [3738382]
ZHANG, Ruda February 24, 2019:  More on matrix theory. [46d0a3a]
ZHANG, Ruda February 24, 2019:  Digitize Xiaohan's Summary of Matrix Analysis. [7d5a29c]